Testing and constitutive modelling of saturated interfaces in dynamic soil-structure interaction.

Persistent Link:
http://hdl.handle.net/10150/187454
Title:
Testing and constitutive modelling of saturated interfaces in dynamic soil-structure interaction.
Author:
Rigby, Douglas Bertrand
Issue Date:
1996
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Cyclic direct and simple-shear experiments are conducted on remolded clay-steel interfaces under undrained conditions and a constant normal stress. Also, a constitutive model for the stress-strain-pore-pressure behavior of cohesive soil interfaces under dynamic loading is developed using the new unified disturbed state concept (DSC). The model is based on elasto-plasticity theory as defined by the hierarchical single surface (HISS) plasticity model. The proposed model is calibrated with laboratory tests and is shown to capture the complex strain-softening, degradation, and pore pressure behavior observed in cyclic loading of piles in saturated clay. Understanding of the mechanical behavior of saturated interfaces between structural and geologic materials and joints in rock, subjected to cyclic loading is important for safe and improved analysis and design of many geotechnical structures. Appropriate testing is vital for the determination of parameters in constitutive models to characterize the mechanical response in terms of stress-strain and failure behavior. A unique laboratory testing device for investigating the dynamic loading effects at the interfaces and joints of materials is described. This new device known as the cyclic multi-degree-of-freedom device with pore fluid pressure effects (CYMDOF-P), can automatically load and test various combinations of material interfaces with dry or saturated conditions and in a direct-shear or simple-shear mode. Based on field observations of instrumented piles it is proposed that there is a thin interface zone of clay between the moving pile and clay mass in which significant shear deformations and generation of pore pressure occur. To explore this behavior, a test program using Gulf of Mexico marine clay is carried out with the CYMDOF-P device. Important behavioral aspects are identified and incorporated as part of the new disturbed-state interface model. Laboratory test results are used for the determination of parameters for the model, and for verification of the model. The model predictions, in general, were found to provide satisfactory correlation with the observations. The procedure to find material parameters for the interface model is described. The model is simple enough to be easily implemented in numerical techniques such as the finite element method, and this implementation is briefly discussed.
Type:
text; Dissertation-Reproduction (electronic)
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Civil Engineering and Engineering Mechanics; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Desai, Chandrakant S.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleTesting and constitutive modelling of saturated interfaces in dynamic soil-structure interaction.en_US
dc.creatorRigby, Douglas Bertranden_US
dc.contributor.authorRigby, Douglas Bertranden_US
dc.date.issued1996en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractCyclic direct and simple-shear experiments are conducted on remolded clay-steel interfaces under undrained conditions and a constant normal stress. Also, a constitutive model for the stress-strain-pore-pressure behavior of cohesive soil interfaces under dynamic loading is developed using the new unified disturbed state concept (DSC). The model is based on elasto-plasticity theory as defined by the hierarchical single surface (HISS) plasticity model. The proposed model is calibrated with laboratory tests and is shown to capture the complex strain-softening, degradation, and pore pressure behavior observed in cyclic loading of piles in saturated clay. Understanding of the mechanical behavior of saturated interfaces between structural and geologic materials and joints in rock, subjected to cyclic loading is important for safe and improved analysis and design of many geotechnical structures. Appropriate testing is vital for the determination of parameters in constitutive models to characterize the mechanical response in terms of stress-strain and failure behavior. A unique laboratory testing device for investigating the dynamic loading effects at the interfaces and joints of materials is described. This new device known as the cyclic multi-degree-of-freedom device with pore fluid pressure effects (CYMDOF-P), can automatically load and test various combinations of material interfaces with dry or saturated conditions and in a direct-shear or simple-shear mode. Based on field observations of instrumented piles it is proposed that there is a thin interface zone of clay between the moving pile and clay mass in which significant shear deformations and generation of pore pressure occur. To explore this behavior, a test program using Gulf of Mexico marine clay is carried out with the CYMDOF-P device. Important behavioral aspects are identified and incorporated as part of the new disturbed-state interface model. Laboratory test results are used for the determination of parameters for the model, and for verification of the model. The model predictions, in general, were found to provide satisfactory correlation with the observations. The procedure to find material parameters for the interface model is described. The model is simple enough to be easily implemented in numerical techniques such as the finite element method, and this implementation is briefly discussed.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineCivil Engineering and Engineering Mechanicsen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairDesai, Chandrakant S.en_US
dc.contributor.committeememberKiousis, Panos D.en_US
dc.contributor.committeememberContractor, Dinshaw N.en_US
dc.contributor.committeememberKundu, Tribikramen_US
dc.contributor.committeememberArmaleh, Sonia Hannaen_US
dc.identifier.proquest9626469en_US
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